(一般作ramparts)
1- a defensive wall of a castle or walled city, having a broad top with a walkway and typically a stone parapet（城堡或城市的）防御墙; 城墙; 壁垒。
1.1
- a defensive or protective barrier防御（或防护）墙, 防御（或防护）壁垒：
the open Pacific broke on the far-off ramparts of the reef.
开阔的太平洋浪潮拍打着离沙洲有相当一段距离的防护墙。
with obj.(一般作be ramparted)
- rare fortify or surround with or as if with a rampart〈罕〉（用防御墙）设防, 保卫; 筑垒保卫：
the town's streets were ramparted with tall mounds of rubble.
镇上的街道垒有高高的碎石碎砖防护墙。
词源
late 16th cent.: from French rempart, from remparer 'fortify, take possession of again', based on Latin ante 'before' + parare 'prepare'.